Alert archive / Nebraska / Tornado Watches in 2008
Tornado Watch 337
The Storm Prediction Center issued this tornado watch at May 22, 2008, 2:13 PM MDT for 7 counties in Nebraska. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2008, 2:13 PM MDT (20:13 UTC)
- Expired
- May 22, 2008, 9:28 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Chase County, NE, Deuel County, NE, Frontier County, NE, Hayes County, NE, Keith County, NE, Lincoln County, NE, Perkins County, NE
The radar
The North Platte radar (KLNX), 128 km from the middle of the area, began a volume at 20:17 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 2:48 PM MDT | Severe Thunderstorm Warning | LBF | Keith, Perkins | 42 min |
| May 22, 3:52 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Hooker, Keith, Lincoln, McPherson | 38 min |
| May 22, 4:03 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Hayes, Perkins | 42 min |
| May 22, 4:30 PM MDT | Tornado Warning | LBF | Chase, Hayes, Perkins | 45 min |
| May 22, 7:06 PM MDT | Tornado Warning | LBF | Frontier | 39 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.2 hours before the alert went out and 68 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 639 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 599 m²/s²
- 0-3 km storm-relative helicity
- 651 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 222011
SEL7
SPC WW 222011
NEZ000-230300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 337
NWS STORM PREDICTION CENTER NORMAN OK
305 PM CDT THU MAY 22 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PORTIONS OF SOUTHWESTERN NEBRASKA
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
1000 PM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST OF
IMPERIAL NEBRASKA TO 25 MILES SOUTHEAST OF NORTH PLATTE NEBRASKA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 334...WW 335...WW 336...
DISCUSSION...DESPITE CLOUDY AND COOL CONDITIONS CURRENTLY LOCATED
ACROSS SWRN NEB...WARM FRONT IS MOVING SLOWLY NWD THROUGH FAR NRN KS
AND MAY MOVE INTO SWRN NEB DURING THE NEXT FEW HOURS. STRONG MID
LEVEL JET WILL SPREAD SUPERCELLS NWD FROM KS. AS THESE STORMS
INTERACT WITH WARM FRONT...TORNADOES WILL BE POSSIBLE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 18035.
...IMYSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:40 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more | 65 min |
| May 21, 9:35 PM MDT | Mesoscale Discussion | SPC | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 25 min |
| May 22, 2:38 AM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Blaine, Boone, Brown, Buffalo and 47 more | 97 min |
| May 22, 11:25 AM MDT | Tornado Watch | SPC | Cheyenne, Kimball | 9 hr |
| May 22, 12:52 PM MDT | Tornado Watch | SPC | Buffalo, Dawson, Dundy, Franklin, Furnas, Gosper and 5 more | 10 hr |
| May 22, 1:29 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Deuel, Frontier and 9 more | 61 min |
| May 22, 2:22 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Blaine, Box Butte, Brown, Cherry and 15 more | 7 hr |
| May 22, 3:02 PM MDT | Mesoscale Discussion | SPC | Dundy, Furnas, Harlan, Hitchcock, Red Willow | 58 min |
| May 22, 5:46 PM MDT | Mesoscale Discussion | SPC | Buffalo, Chase, Dawson, Dundy, Franklin, Frontier and 11 more | 59 min |
Nearby
Tornado Watches in Nebraska, 2008Every tornado watch in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.